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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26fcc64ef13154b2a41014b924d11fb8bf96621a441ddaf9be3cd7d1a5eeb15f' 
  AND token = 'PCNJrp03cBLMrG3lE87GoGTsbEtctSu5xQC7qjNw9Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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