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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb5f68e330441dbf65c989f1612a3dbffd5b00695c07aa3bd3b7e2940c05f26' 
  AND token = 'fSTvprKlJxdJHe3g/SwaRgTGnSnCVPI33PPFS8RKba4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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