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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9acca80b623f4fce549b47697fe25566bca6912c9b06c8782ec4857877c18e00' 
  AND token = 'BWF7eBwkSaXCc9oTsMWeX6lvIkKbgfCNImx7FRoPWxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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