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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdfb3d2d40272e36eab67d13617185e48677a43d4d865e6274eba7f52d7129f6' 
  AND token = 'pigIC+klDqixuPXMZ67KatbbUq7RDr+nFv3lDNoFDlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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