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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a967e7d90fc114cad0581000067786d634036c252cb18c7a3e607129c2f736b4' 
  AND token = 'oDQkhZOytkMAduunEulka+O2aljprHMBUk0IDphWRKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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