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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c57fa34cbfe4c60aaba6c9c9ee382d3d2adc8d4f993d662c91fd95bd079d4d' 
  AND token = 'cwZakRz9axYxu6G6MB28G/v32nwRkF7q2MKHSuZIzAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}