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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '151e5d6a89bb4d123f9dd1b3c7fe178b88c4f56304324a558985997eec56b3b7' 
  AND token = 'x7IfmDhLpFQS5lbd5Z5LpOlem+5a2P2YAJx+cSzY3Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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