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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da38a049bec382c2e2dd963f79ef11cb274071300ba22624bf0d66a845d9a0fa' 
  AND token = 'II+zcCyeOtRtijoSHl/9U5jyZ0PIIj0UU178sxSSGMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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