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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4af2181ac9cf003b7c8905158e643a2f9b24df42bec00501208678e2db3bebe7' 
  AND token = 'eYGOshbarU19qQBGZlUTOAhq0sjuyohIAlr9s4FR3Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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