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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8706f6d5b34bee44f2e30da1ba222bbda670c5fa80c4e87f5c7953454ee13bd6' 
  AND token = 'YzQuKVrDVyHrC/V3A6zfBaJIV4AfFleaIRmyDqN3mb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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