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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0493e7bda63151a46fef9d2c36a598f8969cb22c2af191be7b2ac199480795d6' 
  AND token = 'izH2RTEmCLwheWnDbbkmM5owwHiTSfLq5S+BpkBxmo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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