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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82415096134913cdbfe6c1656f44e23dfe2dec31d180456d8c4ab847ac8e296f' 
  AND token = '0IIt6kPh0PHc6Iz4FmkMgtYVebv+dqiowjmLbRRmzzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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