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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629b57b9ff7edf6c3130d781ad8070d167e904ae343c1d222b9fbf997a687755' 
  AND token = 'd80dGTt93BMtNq4evsomV54yBWGG0fYh59BrpzBYVMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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