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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '890085379f0b5e4bf26a79325c5e763f315db7f2c6efc0bf8dbcf0f1c430f1af' 
  AND token = 'nUHelTZQ4Sn214oDLjcdm63tm/yWfyNCandXpVMBxyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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