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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cfa1f227f10a2b175602cc4da01fb9e54ff32899179396bd763ed4581e7f707' 
  AND token = 'JjMgHuYFgeDIRGFUpRyposGLouFD2gDx72DjQWy+cHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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