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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4638ba10556ef10ab3c93459b344c7ce9d39898c03f1ae1b2dd22894c7acf007' 
  AND token = 'A+Y+mvQt1UJej+fIemb+RoXUEHdA26+moMM7Bo0s5V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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