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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13d422102c463fdea3d52fcfa9970d33542773b5e778bb32f9f970aa0aebded5' 
  AND token = 've6gfl3xJ7PW55sNqwJm4rrg70SA9b2c63Q3yRU/sms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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