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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd479a3faa1c8929a1ece6bf1e9d3635e83cf0e53e43644c664d723528ee92c' 
  AND token = '2SzGymeEI2tWTLpatnX6jg8HG3QYTTIQhreInBgJjTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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