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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ed74cad582c2fcbb108ac92fef7dcfd07b071f8081959a36fc12dd27775df1' 
  AND token = 'iUIeYXnTCKSbwvW6vaq/u2dYFbp5UhE8g0uCTled6vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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