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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb8b768474cc1d6229fe51fa1446e823888c38c3e745112d7b3a64f9bbb7843' 
  AND token = 'iEk6u5glGz4G9h0b/VOFjYdsPOM1MAymu3ssNqh5T2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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