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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e61f460e956ed00bcd4cfe7e19a62123d6cac702c00ad5664d69c81589c3e3f' 
  AND token = 'f7rHixub1PLkL8kB1CKklIXJdXiFwNxRMbMD3FX1T9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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