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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caadf3c5e4ac291f31685786a77b0419139f3bb6438e28007a3196529205c9e2' 
  AND token = 'sn7xZs92LGB2tnGpla8dnV8Bqe7UQ7Kea2CjkCT3xPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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