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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad08cb0ce77d813203e28af5a7b21089848f82bd9be944b82491cd911ed268f' 
  AND token = '/RBZrvkzXiAeOuDxuxPIZ1EK355VSrJ0o+LuHRZS/Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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