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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98bfbf2b7e2a31cbefe29f0d37601fac3ddbf3c56d76130a59ff1bbb9ab19ee3' 
  AND token = 'C0Yusdk++div17R2fapsW0lIbUvmV50vJngj+gO/W7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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