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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceeb1c967aa43d44e5d373229a7aa3014394e57401fc8e9ce9026a24d273e012' 
  AND token = '9BFwj7Daa0xWGffWTRRF2cUWbrQdvXZCZXzhjUG2ULA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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