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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '961eda1cf7acc7eee10bf26fc959398962ab0319b1c602d4b41e2f28412b3c7d' 
  AND token = 'WhhAeLYSLwtcDgMfxlXL+pkqQ7wQcfH39sPMkOURgI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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