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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773de89a178b85ae5e7a887b41e91a2c816c5d93bc276bf19b75c9246f6d0142' 
  AND token = 'OZN1pI5hSd432qMReb5PjGRyNgaZddnnBcnB+Q1LABw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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