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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c65610dc74e5efc025dd36e1d8ff138c4f6079c4aca034e68541946e6f0814c7' 
  AND token = '20+FRw3mM2p94dbf+gGNpLnhSAJdnVdVCO7x5xPPbaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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