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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494fad969747185aaeb1f2b177df28a8450f69a6c08e95ddbad80c2cf3caee3e' 
  AND token = 'idsZ65ImVHookwwPNuJJb2PT9jb9x+ci8CezR0L8lVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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