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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14eb6f970b101b40c3f272289f726856d850ba0c9a3ae7888b928af4dd4342b5' 
  AND token = 'J5DMSRW+wOo3mxMuos+DEncSwxhqWavLmYOUs0s9cwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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