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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea6d96609fbd5a1753eb19174211530f4a6acea06294a7055e63ea5bc19c1b9' 
  AND token = 'u3crkj9teG6VzTU8hiXxBE/pgWAtcTQjNO4+qe4xghI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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