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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c35f67bde9e00d244851cf74030062d3cd5f39e78caf10e0eb2170a1a0839a7' 
  AND token = 'TBDy5WwkscDMavva0cz8A0CFzrb6d4wbRkjXpJzj6ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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