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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ccdb0a01cbe07747d26a83cb06b91c9cf1191255fb158651256d83814b75891' 
  AND token = '36OBoG/I4evMTa/2q+e+tVx0boyp+nD81OtDQGX7OE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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