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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68665978d0acb1c12d1a129518b30322ae7abbab05d45bab60dfd00d1f18aba7' 
  AND token = '5JR+a4Redh/tNw7AIUSec8V+ZeOTluF2yYWMUsKKYa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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