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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b54541d5de506fe776b40ce218c0c448c16aea7b2d4a9cce9203c5e06988bb' 
  AND token = '3pAObhD5NcG4txCdnpO2que8iwKtaBIXmZICuWU6JZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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