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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f047e5e902c6f97befbf1eab5d8b1b1ade15f110a2a3bc75d76010b808fcc8' 
  AND token = 'MeuxgTBAUrVv0xRpZmbcuvS1TeeYfV0BJagZFsKynZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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