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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aaaa747e0a219fb639cfaecc1ad31c939f752a9cc3c14e6fcd52c888612945b' 
  AND token = 'o1Z99vJgXFcm8ZA1S6qD9OzWb3jODGSsUL/ZZ/Pxk7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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