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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda3d1c0cad07b7af43e6bb02e4a1af87bccb8481ee352fa4e4e7cf50516bfc0' 
  AND token = 'rzZAdmJHjClUkDsi7SLoOIs4oMLsn7qkLcQWg5KcixI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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