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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce5dbbf6ba61d886e92c3e1fce364a5abc5e276a3398151e21f2ac3eaaf3ac7' 
  AND token = '13SKD/7U1CJCmo2JrtUS8oqaMlb3cQFkSEfzOUWNVoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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