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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1abd2387455b613f649453027b280e79c39eb4ed320cf061826e9884cc13e4d7' 
  AND token = '26Vne351QdIrn8BPlTzLJPWA2jMMym69dV2+YI+hiqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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