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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13973e1fec4ca0ae9ad5c81dfa952307dadb54bb9d1f12d33cd3f7c4521c5eba' 
  AND token = 'Lm744LV7pyvEc9QfDEi1BazmfsHlP+HJAwcI8k1LgwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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