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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802e0739486eac9c9ee86ba23e471bd5c4315f6289f09b7fe8bc409a0d2fe9d8' 
  AND token = '8UP3aZq7erki6Ht4zX1wTb1Dzs61ltgVK8POUrmVXIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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