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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9977d94f4c9970cff0df863b37ee20a1ac54bf7a80b6c60e253f0cbab3ea333' 
  AND token = 'n2NT+JFEdla6oTYdIIOLytg90NT79GzJ3AMfL32aPfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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