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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee72c510ec6d85e7994fbceb2d8b0a448cc89b926110d94b8e1e9c48c06cf49e' 
  AND token = 'GVLub4RDbc4iSn4C8oY0qdD96ztRsZkN78i3jPmP/BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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