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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5806940f0352a1ab2eec3504113cac32b08a63b4b17cc032a3cd915df2510158' 
  AND token = 'V3+gZfjG73XLNWNWOeiDtKBYyVais5jis1iHJ6dnUTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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