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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66b1ee13747ca40a9a6c2c7a9f63281c737d0d2987677dcd5601028b283af1ad' 
  AND token = 'i4uyc0qBWjZdiJJwIxn/SQFqUs0Es/9NpgTuywp5i9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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