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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d32c4836b5c48e399df9c0bb221da3803920e71e3d95ac62db2a6c9f36e52ae' 
  AND token = 'u0WV/ynyJ+Nf4t5qy28Um9ZzjP46E4czji+rnpss2aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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