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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '668ef3cb249a7f82f89a63d38307adacb24316263d680e162f4d4efbe531bd13' 
  AND token = 'MEWEEex+624nh3DEemy4hvXnkoBFEzpJLMpthi+0W7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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