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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e462e34270b7804bde606eab5d4e93b9537546d925db0a016b0c86bf3f2c390e' 
  AND token = '0M/qcqpqdPPIcpgyqpavy9nvHLn6/GDh3BKk0cwShVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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